Door-shoe construction



April 14, 1925.

P. R. FORMAN noon snoz cons'mucnou Filed Dec. 9,1922

u|llllllllnllllllllllllIll III auoentoz Patented Apr. 14, 1925.;

UNITED," STATES PATENT OFFICE".

PARIS R. FORMAN, OF RAHWAY, NEW JERSEY, ASSIGNOB COMPANY OF NEW- YORK,N. Y., A CORPORATION TO NATIONAL PNE MA IC or WEST VIRGINIA.

nooneseon CONSTRUCTION;

Application filed December 1922. Seria1-1 l'o. 606,'009;

type of doorshoe constructions as is employed in the street railway artwhere the d'oor shoe iscarried at the front edge ofthe door so-that ifin; closing the door encounters'an obstruct-ion the door shoe comes incontact with the obstruction and as a result thereof controls the doormotor to accomplish one of a number of operations.

It is the general practiceto employ the collapsingof the door shoe, or,to be more exact, the contacting of the door shoe with an obstruction tocontrol an electric circuit which in turn controls the door motorwhereby, upon actuation, the doormotor is reversed to causethe doortomove towards the door open position .and thereby allow the obstructionto beremoved.

The particular object of the invention is to provide a door shoeconstruction which,

is simple in structure, efficient in operation and economical inmanufacture.

A further andmorespe'cifio obiect ofthe invention is to provide a doorshoe which renders the safety feature or control effec- V tivethroughout the entire length thereof.

' A further object of the invention is to provide a construction: ofmounting for the l'owere'dge of the door shoe which renders the loweredge thereof as sensitive as any other'portion throughout the lengththereof. Further objects of the invention will appear more fullyhereinafter. v

The invention consists substantially in the construction, combination,l'ocation'and rela-' tive arrangement of parts, all as will be morefully hereinafter'set forth as shown by the accompanaying drawing andfinally pointed out in the appended claims.

Referring to the drawing-2 Figure 1 is a view in elevation partlydiagrammatio and partly? broken away show ing a doorwith a door shoeconstruction of."

my invention applied thereto. I

Fig. 2 is an enlarged detail view partly in section and partly brokenaway of; the lower end of the door showing the support of the door shoe.

Fig. 3 is a similar view showing the up per end of the door shoe andithe support means therefor. l

The same part isRdeSigua-ted by the same reference character wherever itoccurs throughout the several views- It is customary in thestreet carartteem ploy at the front edge of the door," sueh;as.a sliding door 1, whatis generally designated as a shoe and which is illustrated at 2'.

The shoe consists, in this instance, of'a. coil of wire 3 extendingsubstantially theheight of the door. This coil of wire is: connected bymeans of alconductor 4 to a shoe 5 which travels with the door, whichshoe 5 travels on a conducting track ,6 Extending through the center ofthe coilof wire: 3' and normally out of contact therewith is a wire 7which wire is connected by, the wire 8 with a shoe 9 carried by thedoorfwhich shoe travels over the conducting track 10. The wires 3 and 7are coveredgenerally with rubber, canvas or other material 2, and itwill be apparent'that if the shoe comes in contact with an obstructionduring theclosiing movement of the door. the wires 3 and 7, as a resultthereof, will be plaoedincon tact with each other, thereby establishingcircuit connection between the conducting tracks 10 and 6, theestablishment of which circuit is utilized in a manner well understoodin the art to effect the safety controhof the door operatingfmotor,which features form no'partof my present invention.

The top of the shoe 2 issupported by a bracket 15 which is suitablysecured tothe front edge of the door 1 (see Fig. 3') ,a-nd' theinsulating bushing 16 is employed for sup-' porting the end of the wire7 the saidbuslr ing likewise being supported by thebracket 15'; In doorshoe structures of'this natureit will readily be apparent thatasupoortfor the lower edge of the shoe of'similar; con struetion to thatillustrated-for" tlie'topof the shoe, would render the intermediatedesirable that the shoe structure be sensitive substantiallyv throughoutits height and es pecially at'th'e bottom thereof, and my presentinvention is directed to supplying an efficient means for effecting asensitive control of the bottom portion of the shoe. 7

In the form shown I providea bracket pivotally mounted at one end to thefront edge of the door at a point between the top and bottom thereof,the free edge of the bracket forming a support andattachment for thelower end of the shoe 2, the middle wire 7 being insulated from the coil3 by means of a suitable insulating bushing 16, as hereinbeforedescribed.

Secured erably by a pivotal connection 21, is anarm of insulatingmaterial provided'with a conducting portion 22. When the shoe is in itsfully extended position the parts are in the position shown in Figs. 1and 2. When, however, the lower portion of the shoe comes in contactwith anobstruction, the lower ducting WIIGS' portion of the shoestructure is moved around the pivot 23 of the arm or bracket 20 so .thatthe conducting portion 22 of the lever or arm carried thereby is movedso as to establish the circuit connection between the conducting fingers245 and 25 which contact fingers are electrically connected to the con tand 8, as above illustrated. It will readily be apparent from theforegoing that I have thus provided means for ensuring a propercompletion of the circuit between the contact rails 6 and 10,irrespective of where the shoe encounters an obstruct-ion up to theapproximate top of the door itself, and that the means provided are notin substitution to the noiinal control effected by the wires of the shoeitself, but are in addition thereto, whereby either or both becomeeffective.

' The shoe may maintained in its normal eX tended position by any one of'a number of means which will readily suggest themselves to those'skilled'in the'art. By the arrangement in Fig. 2 I show one exceedinglysimple arrangement wherein a spr ng 27 is employed which serves for thispurpose.

Many modifications and changes in details will readily occur to thoseskilled in the art without departing-from the spirit and scope. of myinvention as defined in the claims, but having now set forth the objectsand nature of my invention, and having shown anddescribed a constructionembody ing the principles thereof, what 1 claim as power operated to thepivoted arm 20 and pref new and useful and of my own invention,

and'desir-e to secure by Letters Patent is:

1. p In a safety shoe cont-act device for power" by said first mentionedmeans.

2. In a safety shoe contact device for power operated doors, thecombination with anelectric circuit, of means carried by the front edgeof said door for controlling said circuit, comprising a suspended coil'spring" and a wire located longitudinally therein, saidwire and springcomprising terminals of said circuit, and means for controlling saidcircuit independently of said wire and spring upon movement thereofbodily relative to said door. 1

3. In a safety shoe contact device for doors, the combination with anelectric circuit, of means carried by the front edge of said door forcontrolling said circuit, compri 'ng a suspended coil spring and a wirelocated longitudinally therein, Q

said wire and spring comprising term nals of said circuit, a movablesupport for the lower end of said spring and wire, and

means for controlling said circuit by the movement of said support.-

'4. In a safety shoe contact device for power operated doors, thecombination with an electric circuit, of means carried by the front edgeof said door for controlling said circuit, comprising a suspended coilspring and a wire located longitudinally therein, said wire and springcomprising terminals of said circuit, a support for the lower end ofsaid spring and wire, mounted upon for movement relative tosaid door,and means for controlling said circuit by the movementof said support. Ig r 5. In a safety shoe contact device for power operated doors, thecombination with an electric circuit, of means carried by the front edgeof saiddoorforcontrolling said circuit, comprising a suspended coilspring anda wire located longitudinally therein, said wire and springcomprising terminals of said circuit, a support for the lower end;

of said spring and wire, mounted upon for movement relative to saiddoor, an arm carried'by saidsupport, andterminalsffor said, circuitcontrolled by said-arm whereby said circuit isclosed when said arm-ismoved towards said door.

6. In a safety shoe contact device for power operated doors, thecombination with an electric circuit, of means carried by the front edgeof said door for controlling said circuit, comprising a suspended coilspring and a wire located longitudinally therein,

said wire andspring comprising terminals of said circuit, a support forthe lower end maintaining said arm and support extended of said springand Wire, mounted upon for from sald door.

movement relative to said door, an arm can In testimony whereof I havehereunto set 10 ried by said support, terminals for said cir-- my handon this fifth day of December cuit controlled by said 'arm whereby saidA. 1)., 1922.

circuit is closed When said arm is moved towards said door, and meansfor normally 1 PARIS R. FORMAN.

